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parallax

(Encyclopedia)CE5 The trigonometric parallax of a star, expressed by the angle θ, is a measure of its apparent motion against the background of more distant stars as a result of the earth's motions in its orbit...

inferior planet

(Encyclopedia)inferior planet, planet whose orbit lies inside that of the earth. There are two inferior planets, Mercury and Venus. They always seem to be close to the sun in the sky; the greatest elongation of Mer...

Frey

(Encyclopedia)Frey frā [key], Norse god. He was a beneficent deity associated with the fertilizing powers of the sun and the rain and, like his sister Freyja, with the return of spring. His worship, which extended...

phoenix, in mythology

(Encyclopedia)phoenix, fabulous bird that periodically regenerated itself, used in literature as a symbol of death and resurrection. According to legend, the phoenix lived in Arabia; when it reached the end of its ...

Bouguer, Pierre

(Encyclopedia)Bouguer, Pierre pyĕr bo͞ogĕrˈ [key], 1698–1758, French mathematician and hydrographer. He made some of the first photometric measurements, calculating the intensity of the light of the sun as co...

Ruggles, Carl

(Encyclopedia)Ruggles, Carl, 1876–1971, American composer, b. Marion, Mass. Ruggles studied music at Harvard and was a friend of Charles Ives. His works are highly original, characterized by complex textures and ...

Todd, Mabel Loomis

(Encyclopedia)Todd, Mabel Loomis, 1858–1932, American author, b. Cambridge, Mass. A friend of Emily Dickinson, she edited and deciphered much of the Dickinson material in Poems (with T. W. Higginson, Ser. 1 and S...

Ikhnaton

(Encyclopedia)Ikhnaton äˌkənäˈtən [key] [Egyptian,=Aton is satisfied], d. c.1354 b.c., king of ancient Egypt (c.1372–1354 b.c.), of the XVIII dynasty; son and successor of Amenhotep III. His name at his acc...

Fizeau, Armand Hippolyte Louis

(Encyclopedia)Fizeau, Armand Hippolyte Louis ärmäNˈ ēpôlētˈ lwē fēzōˈ [key], 1819–96, French physicist. The first to measure (1849) the velocity of light in air, he also determined its speed in water. ...

whirlwind

(Encyclopedia)whirlwind, revolving mass of air resulting from local atmospheric instability, such as that caused by intense heating of the ground by the sun on a hot summer day. Examples of whirlwinds are waterspou...